Calvera

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What Wikipedia says

Calvera (also known as 1RXS J141256.0+792204) is an X-ray source in the constellation Ursa Minor, identified in 2007 as an isolated neutron star. It is one of the hottest and closest of its kind to Earth.

Excerpt from the Wikipedia article “Calvera (neutron star)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), CC BY 3.0, via Wikimedia Commons.